Question

1) A tank holds water with a base 2 ft by 6 ft. If a rectangular solid whose dimensions are 1 foot by 1 foot by 2 feet is totally immersed in water, how many inches with the water rise?

A)1/6
B)1
C)2
D)3
E)12

^I got B

2)

AB+BA= CDC
IF each of the four letters in the sum above represent a different digit, which of the following can't be a value of A?

A)6
B)5
C)4
D)3
E)2

^ I got E

3) IF ab =40, a/b=5/2, and which a and b are positive numbers, find the value of a.

^I got a=20

Answer 1

a 1-foot slice of the tank holds 12 ft^3
Your brick only fills 1 ft^3
so, (A)

#2 I agree
#3 a=20 means b=2 but 20/2 ≠ 5/2
b=40/a, so
a/(40/a) = a^2/40 = 5/2
See what you can do with that

Answer 2

A=10?